Shock-absorber.



"E. NEWMAN.

SHOCK ABSORBER. APPLIGAITION FILED sB1 1.14,`1912.

1,078,060. Patented 11011.11, 1913. f

-1 {we} 01 'j L7M i 611mm to be a full, clear, and exact description ofI the invention, such as will enable others- '.DMUN'D w. EWMAN, or AsHLann, vrserivm.

' snocknnsoasna.

specification of Letters raient.

Application mea september 14, i912. serialNo-.izomaj To a-ZZ whom #may concern: l

Be it known that I, EDMUND W NEWMAN,

lof Ashland, in the county of Hanover and State of Virginia, have invented certain new. and useful Improvements in Shock-Absorbers; and I do herebydeclare the'following skilled in the art to which it appertains to make and use the same.

This invent-ion 4relates to the class of shock-absorbers of the dash-pot variety; and

the primary objectis to provide improved .means for controlling the recoil, that is to say, to prevent too violent rebound of the springs; and a. further objectv is to provide differential means for this purpose, the de- 'gree to which the passageway-for the liquid is increased on the recoil being controlled by the extent to which the springshave been.

compressed.

In`the accompanying drawings, Figure 1'A shows my improved shock-absorber" as ap* plied to achassis.. Fig. 2 is a longitudinal sectional view. Fig. 3 is a section-.0n line 3-3, 2. Fig. 4 is a slightlyenlarged sectional view through the piston at right angles to the section. Fig. 2. Fig. 5 shows a' slight modification.

Referring to the drawings, 1 designates a cylinder which is designed to contain oil or other liquid and which is attached, preferably at its lower end, to theLaXle o r lower half of the spring.

2 is a piston within the cylinder; 'and' the piston rod which is shown as connected to the spring or a spring-supportedportion of the vehicle, said rod being extended outwardly through a stuling-box in the top of the cylinder. The piston 2 has a series of ports 4 through which'b'liquid passes when there is a relative movement downward of` the piston, but when the piston moves upwardly .these ports are-closd by `a diskvalve 5 which has a. limited sliding movement relatively to the piston, to which latter it is connected by bolts 6. This valveis of less diameter than the boreof the cylinder so that when the piston is moving downwardly and the valve is unseated, the liquid passing upwardly through the ports mayl find ready'outlet at the periphery of the` valve. One port, 4, of the piston is coincident with a similar port, 4"., of the valve, to

allow. of a slight movement of the piston without resistance.

valves.

lAccording to mylinvention the passage of the vliquid from one side of the piston to the other, on the recoil, is controlled by valve- Inechani-sm l preferably consisting of two valves held-to their seatsby-springs of different tensions, so that on slight jars thepassage of the liquid will be less than when greater compression occurs. In Fig. 2 I

have shown the piston as having a. secondl set of ports whichxare controlledby two spring-held valves 7 and 8, the springs being of different tensions; intended' to Abe seated when the piston is Inovingfdownwardly, under the' compression ofithe vehicle springs, hut one or both of the lvalves will be unseated on `the recoil,v`that' is, as the piston moves upwardly, thereby 'preventing violent'or too sudden rebound..` I have shown these two valves as beingl diametrically oppositmfandthe valve'7 'pas'V having a light spring 9, and the valve 8 a heavy spring. 10, both springs bearing against a. cross-plate 12'carried by the piston rod. l The valve 5 has `openings 13 in line with the It will -be understood, ot' course, that changes may be `made in the construction and arrangement of parts .without departing from the spirit of my invention. For instance, as shown in Fig. l5, instead of locat ing the valves in the piston they may. be Amounted in a -by-pas's 14 connecting the up- .per and lower portions of the cylinder. I .have shown thevalve arrangement in the upper end of this by-pass, and haveindicated the valve 15, havinga vspring of lesser re-v sistance, as mounted in the valve 16, whose" spring is of greater resistance (see Fig. 6).

The advantages of my invention will be readily appreciated by those skilled in the art. It vwill -be Vobservedgthat by means of PatentedN-v. 11, 1913.

These valves are ports controlled by the spring-held.

the spring-held valves there will be a gradual rebound under the recoil of the vehicle springs; and -also that by having these valves under the control of springs of different tensions, under slight shocks only one valve will be unseated,4 whereas under more violent 'shocks both valves will be simultaneously unse'ated.

I claim as lmy invention: y

1. In a shock absorber, the combination with a liquidfcontaining cylinder, of a piston therein, said piston havingl a plurality of ports and valve mechanism for closing said ports when the piston is moved relalos valve mechanism for controlling said pas` tively upward, a valve-controlled passage between opposite sides' of said piston, and

sage comprising valves and springs-of different tensions for holding said valves to their respective seats.

2.4 In a shock absorber, the combination with a liquid-containing cylinder, of apiston in said cylinder having a plurality of' 'ports through whichvliquid is designed to pass when there is a relative movement` in one directionubet-ween the piston and the cylinder,.a valve for closing suchports when said parts are moved in the opposite direction, a plurality of valves carried by said piston for closing portsv therein during the first mentioned movement, and springs varying in tension for holding saidfvalves to Atheir seats, one or all of Vsaid valves being unseated during saidopposite movement.

In a' 4 shock absorber, :the combination E with a liquid-containing cylinder, of 'a piston therein', said piston having a plurality of .ports for the passage of liquid when the piston lis moved downward, said piston also having ports which are closed during suchl downward movement, valve-mechanismforv closing the first-mentioned ports when the piston is moved upwardly, valves carried by said piston forso closing said second ports,

.andf springs difering in tension for normally holding said valves to their seats. y

4. In-a shock "absorber, theI combination with a liquid-containing cylinder, of a pis- .-ton therein, said piston having a plurality Y ports for the passage of liquid when the piston is moved downward, said piston also having ports which .arek closed lduring such downward movement, a valve for closing the .first mentionedports during the upward movement of the piston, said valve having openings coincident with the second'mentloned ports, and 'spring-held valves nor,- mally closing the second mentioned ports and designed to' be unseated only when the piston is'moved upwardly.

In testimony. whereof, I have signed this 'specification inthe presence of two subscrib- 

